Answer
$3.18 \times 10^5$ N/m
Work Step by Step
We simplify the equation for period to find k to obtain:
$k = \frac{4 \pi ^2 m}{T^2} = \frac{4 \pi ^2 (3.73 \times 10^5)}{6.8^2} =$ $3.18 \times 10^5$ N/m
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